JP2005111578A - Power transmission device for groove grinding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lengthen the service life of belts used as power transmission members in a power transmission device for a groove grinding machine and to improve workpiece machining quality by preventing the vibration or the like of a grinding wheel disk. <P>SOLUTION: The grinding wheel disk 25 is rotatably supported to a vertically movable lifting device mounted with a motor 16, and power for rotating the grinding wheel disk 25 is transmitted from the motor 16 to the grinding wheel disk 25. An intermediate transmission shaft 17 interlockingly connected to the motor 16 is disposed between the motor 16 and the grinding wheel disk 25, and the intermediate transmission shaft 17 and the grinding wheel disk 25 are connected in a power transmittable manner by a pair of belts 38 arranged on both sides of a rotation axis direction. The pair of belts 38 are wound between a pair of grinding wheel side pulleys 41 provided on both sides of the rotation axis direction of the grinding wheel disk 25, and a pair of intermediate transmission shaft side pulleys 40 provided at the intermediate transmission shaft 17. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a power transmission device for a groove grinding machine suitable for grinding a workpiece having a linear vane groove, such as a compressor cylinder, and more particularly to a lifting device equipped with a motor and capable of moving vertically. The present invention relates to a power transmission device for a groove grinding machine that supports a grindstone disk so as to be rotatable around a rotation axis and transmits power for rotating the grindstone disk from the motor to the grindstone disk.

  In the power transmission device of this kind of groove grinder, conventionally, a gear-type transmission mechanism is often used as a mechanism for finally transmitting power to the grindstone disc (see Patent Document 1).

  However, in a structure that finally uses a gear type transmission mechanism, the degree of freedom of arrangement of the grindstone disk and the like is limited, and the gear may be damaged when a large impact is applied to the grindstone disk. A structure is adopted in which an intermediate transmission shaft is disposed between the motor and the grindstone disc and power is directly transmitted from the intermediate transmission shaft to the grindstone disc by a belt-type transmission mechanism.

  FIG. 4 is a side view showing an example of the prior art. The lifting device 120 is moved up and down by a lifting drive mechanism (not shown), and a grinding wheel disk driving motor (not shown) is provided above the lifting device 120. A support 122 protruding downward is fixed to the lower part, and a grindstone disk 125 is fixed to the horizontal rotating shaft 124 on the support 122. Between the grindstone disk 125 and the upper motor, an intermediate is provided. A transmission shaft 118 is disposed.

  The intermediate transmission shaft 118 and the upper motor are linked and linked by a first belt-type transmission mechanism 130, and the intermediate transmission shaft 118 and the grindstone disc 125 are linked and linked by a second belt-type transmission mechanism 131. ing.

FIG. 5 is an enlarged cross-sectional view of the VV section of FIG. 4, and the second belt type transmission mechanism 131 is disposed only on one side of the grindstone disc 125 in the direction of the rotational axis. That is, the grindstone rotating shaft 124 is provided with a pulley (toothed pulley) 141 only on one side in the direction of the rotation axis, and a single timing belt 138 is wound around the pulley 141.
JP 2001-341057 A

  In FIG. 5, the support 122 and the rotating grindstone 125 are inserted into the inner hole 160 of the workpiece W and the linear vane groove 161 from above, and are lifted and lowered to be fixed to the outer peripheral end of the rotating grindstone 125. Both ends of the groove 161 are ground by the grinding wheel 162. However, the structure in which the belt 138 is disposed only on one side of the grinding wheel rotating shaft 124 as described above has the following problems.

(1) The transmission capability of the belt 138 is low, an excessive load is often applied to the belt 138, and the life of the belt 138 is short.

(2) Since the tension of the belt 138 is applied only to one side in the rotational axis direction with respect to the grindstone disc 125, the change in the grindstone angle due to the tension of the belt 138 is large, and it takes time to adjust the grindstone angle. That is, if the grinding wheel angle changes, the processing accuracy decreases, so it is necessary to adjust the grinding wheel angle each time the belt 138 is stretched.

(3) Since the tension of the belt 138 is applied only to one side of the grinding wheel disc 125 in the direction of the rotational axis, an eccentric load is applied to the bearing 163 that supports the grinding wheel rotational shaft 124, and the life of the bearing 163 is short.

(4) When the grinding wheel disc 125 is rotated at a high speed (for example, 9000 rpm), if the belt 138 is disposed only on one side, the vibration of the belt 138 greatly affects the machining accuracy.

  In order to solve the above-mentioned problems, the present invention supports a grinding wheel disc that is rotatable about a horizontal rotation axis on a lifting device that can move in the vertical direction and is equipped with a motor, and the grinding wheel disc from the motor to the grinding wheel disc. In a power transmission device for a groove grinding machine that transmits rotational power, an intermediate transmission shaft linked to the motor is disposed between the motor and the grindstone disc, and a belt-type transmission mechanism is interposed between the intermediate transmission shaft and the grindstone disc. The belt transmission mechanism includes a pair of grinding wheel side pulleys provided on both sides of the grinding wheel disc in the rotational axis direction, a pair of intermediate transmission shaft side pulleys provided on the intermediate transmission shaft, and one grinding wheel side. One belt wound around the pulley on the intermediate transmission shaft side corresponding thereto, and the other belt wound around the pulley on the other grinding wheel side and the pulley on the intermediate transmission shaft side corresponding thereto. It is composed.

  Preferably, of the pair of pulleys on the grindstone side, one is integrally formed on the grindstone rotating shaft, the other is screwed onto the grindstone rotating shaft, and the grindstone disc is sandwiched between the two pulleys on the grindstone side.

(1) Since the rotational power is transmitted from the intermediate transmission shaft to the grinding wheel disc by a pair of belts arranged on both sides of the grinding wheel rotation shaft, compared to the case of transmission by one belt as shown in FIGS. , The power transmission capability is increased, the life of the belt is extended, and the need for belt replacement is reduced.

(2) Since the belt tension is applied to both sides of the rotational axis with respect to the grindstone, there is almost no change in the grindstone angle due to the tension of the belt, and the necessity for adjusting the grindstone angle is low.

(3) Since the belt tension is applied to both sides in the direction of the rotation axis with respect to the grindstone disc, a load is evenly applied to the pair of bearings that support the grindstone rotation shaft, and the life of the bearing is long.

(4) When the grindstone disk is rotated at a high speed (for example, 9000 rpm), the belts on both sides can reduce vibrations, thereby improving processing accuracy (flatness).

(Overall structure of groove grinder)
1 to 3 are vane groove grinders for a compressor cylinder to which the present invention is applied. In FIG. 1, which shows a side view of the whole, for convenience of explanation, the workpiece 1 is supplied to the base 1 on the grinder body side. The side on which the index table 2 is arranged is defined as the front side, and the direction perpendicular to the paper surface is defined as the left-right direction.

  A box-shaped slide case 4 is supported on the upper surface of the base 1 via a rail 3 extending in the left-right direction. The slide case 4 is moved over the rail 3 by a ball screw feed mechanism 5 and a servo motor (not shown). It can move left and right.

  A vertical rail 8 is laid on the front end surface of the slide case 4, and an elevating plate 10 is supported on the rail 8 via a slider 9 so as to be vertically movable. A vertical ball screw feed mechanism 12 is provided in the support case 4, and a lead screw 13 of the ball screw feed mechanism 12 is rotatably supported by the slide case 4 and disposed on the upper wall of the slide case 4. The AC servomotor 15 is linked to the output shaft. The elevating plate 10 is coupled to the elevating nut 14 screwed into the main screw 13, and the elevating plate 10 is moved up and down integrally with the elevating nut 14 by rotating the main screw 13 by the AC servo motor 15. It has become.

  A motor 16 for rotating the grinding wheel disc is fixed to the upper part of the front surface of the lifting plate 10, an intermediate transmission case 18 having an intermediate transmission shaft 17 is fixed to an intermediate part in the vertical direction, and a transmission case 20 is fixed to the lower part. A support 22 protruding downward is fixed to the transmission case 20, and a grindstone disc 25 is rotatably supported by the support 22.

(Power transmission mechanism for grinding wheel drive)
A single timing belt 30 is wound between the output pulley 27 of the AC motor 16 and the pulley 28 of the intermediate transmission shaft 17, and is coupled so as to be able to transmit power by the single timing belt 30. And the grindstone rotating shaft 24 are connected to each other by two thin toothed belts 38 on the left and right sides so that power can be transmitted.

  2 is an enlarged cross-sectional view taken along the line II-II of FIG. 1. The intermediate transmission shaft 17 is supported by the intermediate transmission case 18 in a left-right protruding manner via a pair of left and right bearings 45, and one (left) protruding. The pulley 28 on the input side is fixed to the portion, and the pulley 40 on the output side is fixed to the other (right) protruding portion 17a.

  A pair of pulleys 40 of the intermediate transmission shaft 17 are provided at predetermined intervals in the left-right direction, and a pair of pulleys 41 are fixed to the grindstone rotating shaft 24 on the left and right sides of the grindstone disc 25 correspondingly, The thin timing belt 38 is wound around the pair of pulleys 40 of the intermediate transmission shaft 17 and the pair of pulleys 41 of the grindstone rotating shaft 24.

  3 is an enlarged cross-sectional view taken along the line III-III of FIG. 2. In the grindstone disc 25, annular grinding wheels 45 are fixed to both end faces in the direction of the grindstone rotation axis at the outer peripheral end. The abrasive grains are bound to each other by a ceramic metal bond and fixed to the disc main body portion, and the surface of each grinding wheel 45 is a grinding wheel surface.

  The grindstone rotating shaft 24 is horizontally disposed in the support 22 and both left and right ends thereof are supported via bearings 50, and the inner periphery of the grindstone disc 25 is positioned at the center of the left and right width of the grindstone rotating shaft 24. The end portions are fitted and are held between the left and right pulleys 41. One pulley, for example, the left pulley 41 is formed integrally with the grindstone rotating shaft 24, and the right pulley 41 is formed separately from the grindstone rotating shaft 24 and screwed to the threaded portion of the grindstone rotating shaft 24. By tightening the right pulley 41, the grindstone disc 25 is sandwiched between the pulleys 41 as described above. Holes 53 for engaging the rotary tool are formed on the side end surfaces of the pulleys 41 and 41, respectively.

  FIG. 6 shows a work W to be ground by the groove grinding machine of the present invention, for example, a compressor cylinder, which is formed in a cylindrical shape having an inner hole 60 and is positioned at a position symmetrical to the fan-shaped overhanging portion 61 and the overhanging portion 61. The protrusion 62 is integrally formed, and a linear vane groove 63 is formed integrally from the inner hole 60 so as to extend outward in the radial direction and reach the intermediate position of the fan-shaped protruding portion 61.

(Work holding and feeding device)
In FIG. 1, four work holding jigs 56 are fixed on the index table 2 at intervals of 90 ° on the same circumference. A through hole 57 through which the 22 and the grindstone disc 25 can pass in the vertical direction is formed. Although not shown, the index table 2 is also formed with a through hole corresponding to the through hole 57.

  Although not shown, the index table 2 is provided with a workpiece fixing mechanism for fixing the workpiece to the upper surface of the workpiece holding jig 56.

(Groove grinding method)
In FIG. 1, the workpiece W is placed on the upper surface of the workpiece holding jig 56 at the front loading and unloading position P1, and positioned at a predetermined position using a positioning pin or the like.

  At the positioning and clamping position P2 in the middle of the supply process, the workpiece W is fixed at a predetermined position of the workpiece holding jig by a clamping device (not shown).

  At the grinding position P 3, the grindstone disc 25 is lowered from the rising end position A 0, the processing speed is reduced immediately before entering the workpiece W, and then the support 22 is inserted into the inner hole 60 of the workpiece W. At this time, as shown in FIG. 3, the grindstone disc 25 is inserted into the vane groove 63 and both side edges of the linear vane groove 63 are ground. The vane groove 63 does not grind both edges at the same time, but first grinds one edge, and once removes the grindstone disk 25 from the workpiece W, moves the support 22 in the rotational axis direction by a predetermined amount, and again The other end edge of the vane groove 63 is ground through the workpiece W, thereby processing the groove width to a predetermined value.

  During grinding, power is transmitted to the grindstone rotating shaft 24 through a pair of belts 38 and a pair of pulleys 41 located on the left and right sides of the grindstone disc 25, and the grindstone rotating shaft 24 itself is supported by both ends. Has been.

  As described above, the rotational power is transmitted from the intermediate transmission shaft 17 to the grindstone disc 25 by the pair of belts 38 arranged on both sides of the grindstone rotating shaft 24. Therefore, the power transmission capability is increased, and the belt 38 Longer life and less need for belt replacement.

  Since the tension of the belt 38 is applied to both sides of the grinding wheel disc 25 in the rotational axis direction, the change in the grinding wheel angle due to the tension of the belt 38 is almost eliminated, and the necessity for adjusting the grinding wheel angle is low. In addition, a load is evenly applied to the pair of bearings 53 that support the grindstone rotating shaft 24, and the life of the bearings is long.

  Further, when the grindstone disc 25 is rotated at a high speed (for example, 9000 rpm), the belts 38 on both sides can uniformly reduce vibrations, thereby improving the processing accuracy (flatness).

It is a side view of the groove grinding machine concerning this invention. It is the II-II cross-sectional enlarged view of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a side view of a prior art example. It is a VV cross-sectional enlarged view of FIG. It is a top view of a workpiece | work.

Explanation of symbols

16 Motor 17 Intermediate transmission shaft 24 Grinding wheel rotation shaft 25 Grinding wheel disc 38 Belt 40 Pulley on intermediate transmission shaft side 41 Pulley on grinding wheel rotation shaft side 50 Bearing

Claims (2)

The power of the groove grinding machine that supports the grinding wheel disc so that it can rotate around the horizontal axis of rotation on a lifting device that can move in the vertical direction with a motor, and transmits the power for rotating the grinding wheel disc from the motor to the grinding wheel disc. In the transmission device,
Between the motor and the grindstone disc, an intermediate transmission shaft linked to the motor is arranged,
A belt-type transmission mechanism is interposed between the intermediate transmission shaft and the grindstone disc,
The belt-type transmission mechanism includes a pair of grinding wheel side pulleys provided on both sides of the grinding wheel disc in the rotational axis direction, a pair of intermediate transmission shaft side pulleys provided on the intermediate transmission shaft, and one grinding wheel side pulley. And one belt wound around the pulley on the intermediate transmission shaft side corresponding thereto, and the other belt wound around the pulley on the other grinding wheel side and the pulley on the intermediate transmission shaft side corresponding thereto. A power transmission device for a groove grinding machine. One of the grinding wheel side pulleys is integrally formed on the grinding wheel rotation shaft, the other grinding wheel side pulley is screwed onto the grinding wheel rotation shaft, and the grinding wheel disc is sandwiched between the two pulleys on the grinding wheel side. The power transmission device for a groove grinding machine according to claim 1.

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